Or do birds of a feather flock together?
How biologically similar are you and your significant other? Would you expect this to influence romantic chemistry?
New research suggests that you’re most likely to be attracted to someone whose immune system is different from your own. From physorg.com:
“As the proportion of the couple’s shared genotypes increased, womens’ sexual responsivity to their partners decreased, their number of extra-pair sexual partners increased and their attraction to men other than their primary partners increased, particularly during the fertile phase of their cycles,” says Christine Garver-Apgar, author of the study
Interestingly, there’s an additional body of research that suggests humans can subconsciously smell this immune system difference. (Human Vomeronasal Organ Function: A Critical Review of Best and Worst Cases.Chem. Senses 26: 433-445, 2001)
